We too have been unable to download grib files with Iridium GO to Expedition. Downloading grib files to PredictWind Offshore however has worked every time????? Same windows10 laptop, same Iridium GO position/location. I observed  that PW appears to reconnect any time the iridium signal gets low or interrupted till download is completed! I downloaded almost 500KB in less than an hour this afternoon. Expedition appears to quit if initial Iridium signal is low and will not retry. The most I got over the last two weeks was 2KB. So why can the Iridium GO stay connected with PW for an hours but only seconds or a few minutes with Expedition?

Just want to report back that it's working! A very sweet and fast connection. Optimizer and Xgate are GMN products, so you must use the GMN option instead of Nooa or Saildocs.

Nick,
the Iridium Pilot is broadband 128Kb/sec . It's interfaced with the "Optimizer" with "XGate". I'm not talking about Iridium Go. I'm looking for setup parameter for "Expedition". Via the individual IP's I have no trouble communication wireless (WIFI) from the laptop to either optimizer or Iridium Pilot. GMN advises to use Safari to access the internet. No problem either. I'm trying to import weather grip files to Expedition but keep getting a error message. Super frustrating.
May be a screen shot from the internet setup screen? Again, anybody out there who is using this hardware configuration?